81.76% is the change from 340 to 618
Calculation steps:
[( 618 - 340 ) ÷ 340] x 100 = 81.76%
Formula
Percentage change = [(618 - 340) / 340] x 100
Subtract the new number by the original number
618 - 340 = 278
278 ÷ 340 = 0.8176470588235294
0.8176470588235294 x 100 = 81.76%